Day 34 : Services in Kubernetes

Today I have covered,

- What are Services in Kubernetes and how to create them?

- What are the types of Kubernetes Services?

What is Service in Kubernetes?

• A Kubernetes Service is an abstraction which defines a logical set of Pods running somewhere in your cluster, that all provide the same functionality. When created, each Service is assigned a unique IP address (also called clusterIP).

• This address is tied to the lifespan of the Service, and will not change while the Service is alive. Pods can be configured to talk to the Service and know that communication to the Service will be automatically load-balanced out to some pod that is a member of the Service.

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Types of Services in Kubernetes:

• Visual Representation of Services in Kubernetes:

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So before starting the task let's do necessary installation and setup.

• Before Doing the task let's set up the git repository for the same and push the code to the repository.

Steps to follow: Here we will use AWS for Deployment and Git for version control.

Step-01: Open your terminal or any other cloud service.

Step-02: Update and install Docker on your machine.

sudo apt update
sudo apt install docker.io

Step-03: Now give Docker permission for super user of your local machine.

sudo usermod -aG docker $USER && newgrp docker

Step-04: Now let's install Minikube.

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube

Step-05: Now let's start Minikube.

minikube start

• let's connect with docker.

minikube start — driver=docker

Step-06: Now let's check the status of Minikube.

minikube status

Step-07: Now we will install the Command line instruction for Minikube which is Kubectl.

• But first, install snap on your machine.

sudo apt install snap

• CLI for Minikube is Kubectl.

sudo snap install kubectl --classic

Step-08: Now let's check the version of Kubectl.

kubectl version

Step-09: Now Clone the repository from the github. Github Repo link : https://github.com/LondheShubham153/django-todo-cicd.git

git clone https://github.com/LondheShubham153/django-todo-cicd.git

Step-10: Now let's check the files in the repository.

ls
cd django-todo-cicd

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Task-1:

• Create a Service for the deployment.

Step-01: Create a file service.yaml and write the code for the service.

apiVersion: v1
kind: Service
metadata:
  name: django-todo-services
  namespace: python-django-app
spec:
  type: NodePort
  selector:
    app: django-app
  ports:
  - protocol: TCP
    port: 8000
    targetPort: 30007

• Now let's create a namespace first for the deployment.

kubectl create namespace python-django-app

• As we have created services and namespace now lets create a deployment.

Syntax: kubectl create -f <filename> -n <namespace>

kubectl create -f service.yaml -n python-django-app

• Now verify the deployment and service.

kubectl get all -n python-django-app

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Task-2:

• Create a ClusterIP service for the deployment.

Step-01: Create a file clusterip-service.yaml and write the code for the service.

apiVersion: v1
kind: Service
metadata:
  name: django-todo-services
  namespace: python-django-app
spec:
  type: NodePort
  selector:
    app: django-app
  ports:
  - protocol: TCP
    port: 8000
    targetPort: 8000
  type: ClusterIP

• Now let's create a deployment.

Syntax: kubectl create -f <filename> -n <namespace>

kubectl create -f clusterip-service.yaml -n python-django-app

• Check of the Service is created or not.

kubectl get svc -n python-django-app

• Now verify the deployment and service.

kubectl get all -n python-django-app

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Task-3:

• Create a LoadBalancer service for the deployment.

step-1: Create a file loadbalancer-service.yaml and write the code for the service.

apiVersion: v1
kind: Service
metadata:
  name: django-todo-lb-services
  namespace: python-django-app
spec:
  type: NodePort
  selector:
    app: django-app
  ports:
  - protocol: TCP
    port: 8000
    targetPort: 8000
  type: LoadBalancer

• Now let's create a deployment. syntax: kubectl create -f <filename> -n <namespace>

kubectl create -f loadbalancer-service.yaml -n python-django-app

• Check of the Service is created or not.

kubectl get svc -n python-django-app
minikube service list

• Now verify the deployment and service.

kubectl get all -n python-django-app

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Happy Learning :)